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-rw-r--r--doc/ThornGuide/cactus.sty1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/ThornGuide/cactus.sty b/doc/ThornGuide/cactus.sty
index 573acdc1..ba219193 100644
--- a/doc/ThornGuide/cactus.sty
+++ b/doc/ThornGuide/cactus.sty
@@ -39,6 +39,7 @@
\RequirePackage{graphicx}
\RequirePackage{latexsym}
+\RequirePackage{amssymb}
\RequirePackage{ifthen}
\RequirePackage{calc}